.app {
  position: relative;
}

.app-header {
  height: 60px;
  background: #f5f5f5;
  border-bottom: 1px solid #e0e0e0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.app-header h3 {
  margin: 0;
}

.app-body {
  display: flex;
  height: calc(100vh - 90px);
}

.app-left {
  flex: 1;
  background: #fafbfc;
  border-right: 1px solid #e0e0e0;
  overflow-y: scroll;
  padding: 4px;
}

.app-right {
  flex: 9;
  background: #fff;
  overflow: scroll;
}

.app-footer {
  height: 30px;
  line-height: 30px;
  background: #f5f5f5;
  border-top: 1px solid #e0e0e0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 24px;
}

.app .settings {
  z-index: 1;
  font-size: 14px;
  background-color: #fff;
  position: fixed;
  left: calc(50% - 100px);
  border: 1px solid #ccc;
  padding: 10px 20px;
  bottom: 30px;
  right: 0;
  left: unset;
}

.app .settings button {
  font-size: 14px;  
}
